Incandescent lamp.



No. 540,465. Patented Jan. 2, 1900. E. W. GILLMER.

INCANDESGENT LAMP.

(Application filed Mar. 4, 1898.)

ElilliIER W. GILLMER, OF WARREN, OHIO.

'EMGANDESCEZN'F LAW/l P.

SPECIFICATION forming part of Letters Patent No. 6&OA65, dated January2, 1900.

Application filed March 4, 1898. Serial No. 672,475. (No model.)

fication, in which- Figure 1 is a side elevation of an incandescentelectric lamp provided with my improved filament-anchor, and Fig. 2 isan enlarged cross-section of the glass stem with the lower end of theanchor twisted about it.

My invention relates to the anchors employed for holding the filamentsof incandescent lamps in position and is designed to provide an improvedmeans for securing these anchors in place. Heretofore the wires formingthe anchors were sealed at their lower ends in the glass of the stem,and this sealing operation was a source of considerable delay andexpense in the manufacture of the lamp.

My invention does away with the sealing of the wire anchor; and itconsists in bending the lower end of the wire around the glass stem,twisting the two parts of the wire about each other, and then bendingone end down over the side of the glass stem, so as to form a brace forthe anchor.

in the drawings, 2 represents an incandescent-lamp bulb containing inits base portion the glass stem 3. Sealed through this stem are thelead-in wires i it, to the inner ends of which are joined the ends ofthe filament 5. This filament may be of any desired length or shape, butis preferably provided with intermediate coils or loops, as indicated inFig. 1.

6 is the anchor, which consists of a strip of wire, the upper end ofwhich is secured either directly to the coil of the filament or providedwith an intermediate strip of platinum wire secured to the filament andto the wire anchor. The lower end of this anchor-wire is bent around theglass stem a short distance below its top and then the two parts aretwisted together, as shown at 7, the free end 8 of the wire being thenturned or bent so as to be hooked over the top of the stem and extenddownwardly on the opposite side.

The advantages of my invention will be ap parent to those skilled in theart, since a si111- ple and effective means for securing the anohor isprovided and which does away with the necessity for sealing the anchorin the glass of the stem.

I claim In an incandescent lamp, the combination with the glass stem, ofa filament-anchor composed of a wire having its lower end looped aroundthe glass stem and the two parts twisted together at one side of thestem, the free end being bent down upon the otherside of the stem toform a brace.

In testimony whereof I have hereunto set my hand.

ELMER W. GILLMER.

Witnesses:

T. H. GILLMER, WM. WALLACE.

